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\title{\boldmath{ $a^-_0(980)$}\ \ \ \ \ \ \ $***$}
\maketitle
The $a^-_0(980)$ is the charged member of the lightest scalar isospin triplet. The measurement of the $a_0$ parameters is complicated because it is close to the $KK$ threshold. We chose to use a Flatte parameterisation from \cite{Bugg:1994mg} ,\cite{Rubin:2004cq}  for the lineshape. We therefore take the mass from this paper. As we are using this parameterisation for the lineshape the width is not used and the value given is simply the value for an on-shell $a^-_0(980)$ from the parameterisation. The partial widths from the Flatte parameterisation are used to determined the branching ratios which vary with the off-shell mass. The branching ratios in the table are therefore not used. The values given are indicative and were calculated in $D^0\to a_0^+K^-$ decays.

The $a^-_0(980)$ has mass $999$~MeV and is unstable. The $a^-_0(980)$ has spin $0$, charge $-1$ and is colour neutral.
 The $a^-_0(980)$ is a mesonThe $a^-_0(980)$ has width $177.8$~MeV. The lower limit on the mass of the particle is $240$~MeV and the upper limit is $560$~MeV. These are the deviations from the on-shell value. The branching ratios are allowed to vary with the off-shell mass of the particle.
The properties of the particle and its antiparticle are taken to be charge-conjugate to each other.
 The PDG code is -9000211.
\setlongtables
\begin{longtable}[t]{|c|c|c|p{1in}|p{2.5in}|c|}
\hline
Branching & Rating & On/ & Outgoing  & Description & Decayer  \\ 
Ratio     &                                 & Off & Particles &             &         \\ 
\hline
\endhead
\caption{The decay modes of the $a^-_0(980)$ (continues).}
\endfoot
\caption{The decay modes of the $a^-_0(980)$.}
\endlastfoot
\label{tab:-9000211decaymodes}
0.907000 & $***$ & on & $ \eta, \pi^- $  & The dominant decay of the $a^-_0(980)$. The calculation of the branching ratio is described above.   & Herwig::ScalarScalarScalar::ScalarSS \\ 
\hline
0.093000 & $***$ & on & $ K^-, K^0 $  & The sub-dominant decay mode of $a^-_0(980)$ where the branching ratio is calculated as described above.   & Herwig::ScalarScalarScalar::ScalarSS \\ 
\hline
\end{longtable}The $a^-_0(980)$ decay modes are given in Table~\ref{tab:-9000211decaymodes} and the total branching ratio is $1$.


The mass generator is \verb|a_0+mass| for the $a^-_0(980)$.
The width generator is \verb|a_0+width| for the $a^-_0(980)$.

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 The particle was checked by Peter Richardson at 21:41:58 on the 20th of October 2007. The most recently changed decay mode was modified at 13:48:8 on the 15th of August 2007. The particle data was last modified at 13:47:9 on the 15th of August 2007.

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